ZipOutputStream Apache Ant 1.7.1)

Description

public class ZipOutputStream

Reimplementation of java.util.zip.ZipOutputStream that does handle the extended functionality of this package, especially internal/external file attributes and extra fields with different layouts for local file data and central directory entries.

This class will try to use RandomAccessFile when you know that the output is going to go to a file.

If RandomAccessFile cannot be used, this implementation will use a Data Descriptor to store size and CRC information for DEFLATED entries, this means, you don't need to calculate them yourself. Unfortunately this is not possible for the STORED method, here setting the CRC and uncompressed size information is required before putNextEntry can be called.

See also:

Methods

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protectedstatic long adjustToLong (int i)

Assumes a negative integer really is a positive integer that has wrapped around and re-creates the original value.

public void close () throws java.io.IOException [Overrides java.io.FilterOutputStream]

Closes this output stream and releases any system resources associated with the stream.

public void closeEntry () throws java.io.IOException

Writes all necessary data for this entry.

protectedfinal void deflate () throws java.io.IOException

Writes next block of compressed data to the output stream.

public void finish () throws java.io.IOException

Finishs writing the contents and closes this as well as the underlying stream.

public void flush () throws java.io.IOException [Overrides java.io.FilterOutputStream]

Flushes this output stream and forces any buffered output bytes to be written out to the stream.

protected byte getBytes (java.lang.String name) throws java.util.zip.ZipException

Retrieve the bytes for the given String in the encoding set for this Stream.

public java.lang.String getEncoding ()

The encoding to use for filenames and the file comment.

public boolean isSeekable ()

This method indicates whether this archive is writing to a seekable stream (i.e., to a random access file).

public void putNextEntry (ZipEntry ze) throws java.io.IOException

Begin writing next entry.

public void setComment (java.lang.String comment)

Set the file comment.

public void setEncoding (java.lang.String encoding)

The encoding to use for filenames and the file comment.

public void setLevel (int level)

Sets the compression level for subsequent entries.

public void setMethod (int method)

Sets the default compression method for subsequent entries.

Default is DEFLATED.

Parameters:
- method - an int from java.util.zip.ZipEntry
Since: 1.1

protectedstatic ZipLong toDosTime (java.util.Date time)

Convert a Date object to a DOS date/time field.

Convert a Date object to a DOS date/time field.
Returns: the date as a ZipLong
Parameters:
- time - the Date to convert
Since: 1.1

protectedstatic byte toDosTime (long t)

Convert a Date object to a DOS date/time field.

public void write (byte[] arg0) throws java.io.IOException [Inherited From java.io.FilterOutputStream]

public void write (byte[] b, int offset, int length) throws java.io.IOException [Overrides java.io.FilterOutputStream]

Writes bytes to ZIP entry.

public void write (int b) throws java.io.IOException [Overrides java.io.FilterOutputStream] [Specified in java.io.OutputStream]

Writes a single byte to ZIP entry.

protected void writeCentralDirectoryEnd () throws java.io.IOException

Writes the "End of central dir record".

protected void writeCentralFileHeader (ZipEntry ze) throws java.io.IOException

Writes the central file header entry.

protected void writeDataDescriptor (ZipEntry ze) throws java.io.IOException

Writes the data descriptor entry.

protected void writeLocalFileHeader (ZipEntry ze) throws java.io.IOException

Writes the local file header entry

protectedfinal void writeOut (byte[] data) throws java.io.IOException

Write bytes to output or random access file.

protectedfinal void writeOut (byte[] data, int offset, int length) throws java.io.IOException

Write bytes to output or random access file.

Fields

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protected byte buf

This buffer servers as a Deflater.

protectedfinalstatic byte CFH_SIG

central file header signature

protectedfinalstatic byte DD_SIG

data descriptor signature

protected java.util.zip.Deflater def

This Deflater object is used for output.

publicfinalstatic int DEFAULT_COMPRESSION = "-1"

Default compression level for deflated entries.

publicfinalstatic int DEFLATED = "8"

Compression method for deflated entries.

protectedfinalstatic byte EOCD_SIG

end of central dir signature

protectedfinalstatic byte LFH_SIG

local file header signature

protected java.io.OutputStream out [Inherited From java.io.FilterOutputStream]

publicfinalstatic int STORED = "0"

Compression method for stored entries.